Messages in this thread | | | Subject | Re: [PATCH v23 00/28] Control-flow Enforcement: Shadow Stack | From | "Yu, Yu-cheng" <> | Date | Tue, 16 Mar 2021 14:34:32 -0700 |
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On 3/16/2021 2:15 PM, Peter Zijlstra wrote: > On Tue, Mar 16, 2021 at 08:10:26AM -0700, Yu-cheng Yu wrote: >> Control-flow Enforcement (CET) is a new Intel processor feature that blocks >> return/jump-oriented programming attacks. Details are in "Intel 64 and >> IA-32 Architectures Software Developer's Manual" [1]. >> >> CET can protect applications and the kernel. This series enables only >> application-level protection, and has three parts: >> >> - Shadow stack [2], >> - Indirect branch tracking [3], and >> - Selftests [4]. > > CET is marketing; afaict SS and IBT are 100% independent and there's no > reason what so ever to have them share any code, let alone a Kconfig > knob.
We used to have shadow stack and ibt under separate Kconfig options, but in a few places they actually share same code path, such as the XSAVES supervisor states and ELF header for example. Anyways I will be happy to make changes again if there is agreement.
> > In fact, I think all of this would improve is you remove the CET name > from all of this entirely. Put this series under CONFIG_X86_SHSTK (or > _SS) and use CONFIG_X86_IBT for the other one. > > Similarly with the .c file. > > All this CET business is just pure confusion. >
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